Ejemplo n.º 1
0
static void try_fill_recv(struct virtnet_info *vi)
{
	struct sk_buff *skb;
	struct scatterlist sg[1+MAX_SKB_FRAGS];
	int num, err;

	sg_init_table(sg, 1+MAX_SKB_FRAGS);
	for (;;) {
		skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN);
		if (unlikely(!skb))
			break;

		skb_put(skb, MAX_PACKET_LEN);
		vnet_hdr_to_sg(sg, skb);
		num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
		skb_queue_head(&vi->recv, skb);

		err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb);
		if (err) {
			skb_unlink(skb, &vi->recv);
			kfree_skb(skb);
			break;
		}
		vi->num++;
	}
	if (unlikely(vi->num > vi->max))
		vi->max = vi->num;
	vi->rvq->vq_ops->kick(vi->rvq);
}
Ejemplo n.º 2
0
static int start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct virtnet_info *vi = netdev_priv(dev);
	int num, err;
	struct scatterlist sg[1+MAX_SKB_FRAGS];
	struct virtio_net_hdr *hdr;
	const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
	DECLARE_MAC_BUF(mac);

	sg_init_table(sg, 1+MAX_SKB_FRAGS);

	pr_debug("%s: xmit %p %s\n", dev->name, skb, print_mac(mac, dest));

	free_old_xmit_skbs(vi);

	/* Encode metadata header at front. */
	hdr = skb_vnet_hdr(skb);
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
		hdr->csum_start = skb->csum_start - skb_headroom(skb);
		hdr->csum_offset = skb->csum_offset;
	} else {
		hdr->flags = 0;
		hdr->csum_offset = hdr->csum_start = 0;
	}

	if (skb_is_gso(skb)) {
		hdr->gso_size = skb_shinfo(skb)->gso_size;
		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4_ECN;
		else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
		else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
		else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
		else
			BUG();
	} else {
		hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
		hdr->gso_size = 0;
	}

	vnet_hdr_to_sg(sg, skb);
	num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
	__skb_queue_head(&vi->send, skb);
	err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
	if (err) {
		pr_debug("%s: virtio not prepared to send\n", dev->name);
		skb_unlink(skb, &vi->send);
		netif_stop_queue(dev);
		return NETDEV_TX_BUSY;
	}
	vi->svq->vq_ops->kick(vi->svq);

	return 0;
}
Ejemplo n.º 3
0
uint BCMFASTPATH
osl_dma_map(osl_t *osh, void *va, uint size, int direction, void *p, hnddma_seg_map_t *dmah)
{
	int dir;

	ASSERT((osh && (osh->magic == OS_HANDLE_MAGIC)));
	dir = (direction == DMA_TX)? PCI_DMA_TODEVICE: PCI_DMA_FROMDEVICE;

#if defined(__ARM_ARCH_7A__) && defined(BCMDMASGLISTOSL)
	if (dmah != NULL) {
		int32 nsegs, i, totsegs = 0, totlen = 0;
		struct scatterlist *sg, _sg[16];
		struct sk_buff *skb;
		for (skb = (struct sk_buff *)p; skb != NULL; skb = PKTNEXT(osh, skb)) {
			sg = &_sg[totsegs];
			if (skb_is_nonlinear(skb)) {
				nsegs = skb_to_sgvec(skb, sg, 0, PKTLEN(osh, skb));
				ASSERT((nsegs > 0) && (nsegs <= 16));
				pci_map_sg(osh->pdev, sg, nsegs, dir);
			} else {
				nsegs = 1;
				sg->page_link = 0;
				sg_set_buf(sg, PKTDATA(osh, skb), PKTLEN(osh, skb));

				pci_map_single(osh->pdev, PKTDATA(osh, skb),
				    PKTISCTF(osh, skb) ? CTFMAPSZ : PKTLEN(osh, skb), dir);
			}
			totsegs += nsegs;
			totlen += PKTLEN(osh, skb);
		}
		dmah->nsegs = totsegs;
		dmah->origsize = totlen;
		for (i = 0, sg = _sg; i < totsegs; i++, sg++) {
			dmah->segs[i].addr = sg_phys(sg);
			dmah->segs[i].length = sg->length;
		}
		return dmah->segs[0].addr;
	}
#endif

	return (pci_map_single(osh->pdev, va, size, dir));
}
Ejemplo n.º 4
0
static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
{
	struct ipv6hdr *iph;
	struct ipv6_esp_hdr *esph;
	struct esp_data *esp = x->data;
	struct crypto_blkcipher *tfm = esp->conf.tfm;
	struct blkcipher_desc desc = { .tfm = tfm };
	struct sk_buff *trailer;
	int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
	int alen = esp->auth.icv_trunc_len;
	int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen;

	int hdr_len = skb->h.raw - skb->nh.raw;
	int nfrags;
	int ret = 0;

	if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) {
		ret = -EINVAL;
		goto out;
	}

	if (elen <= 0 || (elen & (blksize-1))) {
		ret = -EINVAL;
		goto out;
	}

	/* If integrity check is required, do this. */
        if (esp->auth.icv_full_len) {
		u8 sum[alen];

		ret = esp_mac_digest(esp, skb, 0, skb->len - alen);
		if (ret)
			goto out;

		if (skb_copy_bits(skb, skb->len - alen, sum, alen))
			BUG();

		if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
			x->stats.integrity_failed++;
			ret = -EINVAL;
			goto out;
		}
	}

	if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
		ret = -EINVAL;
		goto out;
	}

	skb->ip_summed = CHECKSUM_NONE;

	esph = (struct ipv6_esp_hdr*)skb->data;
	iph = skb->nh.ipv6h;

	/* Get ivec. This can be wrong, check against another impls. */
	if (esp->conf.ivlen)
		crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);

        {
		u8 nexthdr[2];
		struct scatterlist *sg = &esp->sgbuf[0];
		u8 padlen;

		if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg) {
				ret = -ENOMEM;
				goto out;
			}
		}
		skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen);
		ret = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
		if (unlikely(sg != &esp->sgbuf[0]))
			kfree(sg);
		if (unlikely(ret))
			goto out;

		if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
			BUG();

		padlen = nexthdr[0];
		if (padlen+2 >= elen) {
			LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen);
			ret = -EINVAL;
			goto out;
		}
		/* ... check padding bits here. Silly. :-) */ 

		pskb_trim(skb, skb->len - alen - padlen - 2);
		ret = nexthdr[1];
	}

	skb->h.raw = __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen) - hdr_len;

out:
	return ret;
}
Ejemplo n.º 5
0
/*
 * Note: detecting truncated vs. non-truncated authentication data is very
 * expensive, so we only support truncated data, which is the recommended
 * and common case.
 */
static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
{
	struct iphdr *iph;
	struct ip_esp_hdr *esph;
	struct esp_data *esp = x->data;
	struct crypto_blkcipher *tfm = esp->conf.tfm;
	struct blkcipher_desc desc = { .tfm = tfm };
	struct sk_buff *trailer;
	int blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
	int alen = esp->auth.icv_trunc_len;
	int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
	int nfrags;
	int ihl;
	u8 nexthdr[2];
	struct scatterlist *sg;
	int padlen;
	int err;

	if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
		goto out;

	if (elen <= 0 || (elen & (blksize-1)))
		goto out;

	/* If integrity check is required, do this. */
	if (esp->auth.icv_full_len) {
		u8 sum[alen];

		err = esp_mac_digest(esp, skb, 0, skb->len - alen);
		if (err)
			goto out;

		if (skb_copy_bits(skb, skb->len - alen, sum, alen))
			BUG();

		if (unlikely(memcmp(esp->auth.work_icv, sum, alen))) {
			x->stats.integrity_failed++;
			goto out;
		}
	}

	if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0)
		goto out;

	skb->ip_summed = CHECKSUM_NONE;

	esph = (struct ip_esp_hdr*)skb->data;

	/* Get ivec. This can be wrong, check against another impls. */
	if (esp->conf.ivlen)
		crypto_blkcipher_set_iv(tfm, esph->enc_data, esp->conf.ivlen);

	sg = &esp->sgbuf[0];

	if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
		sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
		if (!sg)
			goto out;
	}
	skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
	err = crypto_blkcipher_decrypt(&desc, sg, sg, elen);
	if (unlikely(sg != &esp->sgbuf[0]))
		kfree(sg);
	if (unlikely(err))
		return err;

	if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
		BUG();

	padlen = nexthdr[0];
	if (padlen+2 >= elen)
		goto out;

	/* ... check padding bits here. Silly. :-) */ 

	iph = skb->nh.iph;
	ihl = iph->ihl * 4;

	if (x->encap) {
		struct xfrm_encap_tmpl *encap = x->encap;
		struct udphdr *uh = (void *)(skb->nh.raw + ihl);

		/*
		 * 1) if the NAT-T peer's IP or port changed then
		 *    advertize the change to the keying daemon.
		 *    This is an inbound SA, so just compare
		 *    SRC ports.
		 */
		if (iph->saddr != x->props.saddr.a4 ||
		    uh->source != encap->encap_sport) {
			xfrm_address_t ipaddr;

			ipaddr.a4 = iph->saddr;
			km_new_mapping(x, &ipaddr, uh->source);
				
			/* XXX: perhaps add an extra
			 * policy check here, to see
			 * if we should allow or
			 * reject a packet from a
			 * different source
			 * address/port.
			 */
		}
	
		/*
		 * 2) ignore UDP/TCP checksums in case
		 *    of NAT-T in Transport Mode, or
		 *    perform other post-processing fixes
		 *    as per draft-ietf-ipsec-udp-encaps-06,
		 *    section 3.1.2
		 */
		if (x->props.mode == XFRM_MODE_TRANSPORT ||
		    x->props.mode == XFRM_MODE_BEET)
			skb->ip_summed = CHECKSUM_UNNECESSARY;
	}

	iph->protocol = nexthdr[1];
	pskb_trim(skb, skb->len - alen - padlen - 2);
	skb->h.raw = __skb_pull(skb, sizeof(*esph) + esp->conf.ivlen) - ihl;

	return 0;

out:
	return -EINVAL;
}
Ejemplo n.º 6
0
static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;
	struct iphdr *top_iph;
	struct ip_esp_hdr *esph;
	struct crypto_blkcipher *tfm;
	struct blkcipher_desc desc;
	struct esp_data *esp;
	struct sk_buff *trailer;
	int blksize;
	int clen;
	int alen;
	int nfrags;

	/* Strip IP+ESP header. */
	__skb_pull(skb, skb->h.raw - skb->data);
	/* Now skb is pure payload to encrypt */

	err = -ENOMEM;

	/* Round to block size */
	clen = skb->len;

	esp = x->data;
	alen = esp->auth.icv_trunc_len;
	tfm = esp->conf.tfm;
	desc.tfm = tfm;
	desc.flags = 0;
	blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
	clen = ALIGN(clen + 2, blksize);
	if (esp->conf.padlen)
		clen = ALIGN(clen, esp->conf.padlen);

	if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0)
		goto error;

	/* Fill padding... */
	do {
		int i;
		for (i=0; i<clen-skb->len - 2; i++)
			*(u8*)(trailer->tail + i) = i+1;
	} while (0);
	*(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
	pskb_put(skb, trailer, clen - skb->len);

	__skb_push(skb, skb->data - skb->nh.raw);
	top_iph = skb->nh.iph;
	esph = (struct ip_esp_hdr *)(skb->nh.raw + top_iph->ihl*4);
	top_iph->tot_len = htons(skb->len + alen);
	*(u8*)(trailer->tail - 1) = top_iph->protocol;

	/* this is non-NULL only with UDP Encapsulation */
	if (x->encap) {
		struct xfrm_encap_tmpl *encap = x->encap;
		struct udphdr *uh;
		u32 *udpdata32;

		uh = (struct udphdr *)esph;
		uh->source = encap->encap_sport;
		uh->dest = encap->encap_dport;
		uh->len = htons(skb->len + alen - top_iph->ihl*4);
		uh->check = 0;

		switch (encap->encap_type) {
		default:
		case UDP_ENCAP_ESPINUDP:
			esph = (struct ip_esp_hdr *)(uh + 1);
			break;
		case UDP_ENCAP_ESPINUDP_NON_IKE:
			udpdata32 = (u32 *)(uh + 1);
			udpdata32[0] = udpdata32[1] = 0;
			esph = (struct ip_esp_hdr *)(udpdata32 + 2);
			break;
		}

		top_iph->protocol = IPPROTO_UDP;
	} else
		top_iph->protocol = IPPROTO_ESP;

	esph->spi = x->id.spi;
	esph->seq_no = htonl(++x->replay.oseq);
	xfrm_aevent_doreplay(x);

	if (esp->conf.ivlen) {
		if (unlikely(!esp->conf.ivinitted)) {
			get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
			esp->conf.ivinitted = 1;
		}
		crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
	}

	do {
		struct scatterlist *sg = &esp->sgbuf[0];

		if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg)
				goto error;
		}
		skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
		err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
		if (unlikely(sg != &esp->sgbuf[0]))
			kfree(sg);
	} while (0);

	if (unlikely(err))
		goto error;

	if (esp->conf.ivlen) {
		memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
		crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
	}

	if (esp->auth.icv_full_len) {
		err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data,
				     sizeof(*esph) + esp->conf.ivlen + clen);
		memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
	}

	ip_send_check(top_iph);

error:
	return err;
}
Ejemplo n.º 7
0
int esp_output(struct sk_buff *skb)
{
	int err;
	struct dst_entry *dst = skb->dst;
	struct xfrm_state *x  = dst->xfrm;
	struct iphdr *iph, *top_iph;
	struct ip_esp_hdr *esph;
	struct crypto_tfm *tfm;
	struct esp_data *esp;
	struct sk_buff *trailer;
	struct udphdr *uh = NULL;
	struct xfrm_encap_tmpl *encap = NULL;
	int blksize;
	int clen;
	int alen;
	int nfrags;
	union {
		struct iphdr	iph;
		char 		buf[60];
	} tmp_iph;

	/* First, if the skb is not checksummed, complete checksum. */
	if (skb->ip_summed == CHECKSUM_HW && skb_checksum_help(skb) == NULL) {
		err = -EINVAL;
		goto error_nolock;
	}

	spin_lock_bh(&x->lock);
	err = xfrm_check_output(x, skb, AF_INET);
	if (err)
		goto error;
	err = -ENOMEM;

	/* Strip IP header in transport mode. Save it. */
	if (!x->props.mode) {
		iph = skb->nh.iph;
		memcpy(&tmp_iph, iph, iph->ihl*4);
		__skb_pull(skb, iph->ihl*4);
	}
	/* Now skb is pure payload to encrypt */

	/* Round to block size */
	clen = skb->len;

	esp = x->data;
	alen = esp->auth.icv_trunc_len;
	tfm = esp->conf.tfm;
	blksize = (crypto_tfm_alg_blocksize(tfm) + 3) & ~3;
	clen = (clen + 2 + blksize-1)&~(blksize-1);
	if (esp->conf.padlen)
		clen = (clen + esp->conf.padlen-1)&~(esp->conf.padlen-1);

	if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0)
		goto error;

	/* Fill padding... */
	do {
		int i;
		for (i=0; i<clen-skb->len - 2; i++)
			*(u8*)(trailer->tail + i) = i+1;
	} while (0);
	*(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
	pskb_put(skb, trailer, clen - skb->len);

	encap = x->encap;

	iph = skb->nh.iph;
	if (x->props.mode) {
		top_iph = (struct iphdr*)skb_push(skb, x->props.header_len);
		esph = (struct ip_esp_hdr*)(top_iph+1);
		if (encap && encap->encap_type) {
			switch (encap->encap_type) {
			case UDP_ENCAP_ESPINUDP:
				uh = (struct udphdr*) esph;
				esph = (struct ip_esp_hdr*)(uh+1);
				top_iph->protocol = IPPROTO_UDP;
				break;
			default:
				printk(KERN_INFO
				       "esp_output(): Unhandled encap: %u\n",
				       encap->encap_type);
				top_iph->protocol = IPPROTO_ESP;
				break;
			}
		} else
			top_iph->protocol = IPPROTO_ESP;
		*(u8*)(trailer->tail - 1) = IPPROTO_IPIP;
		top_iph->ihl = 5;
		top_iph->version = 4;
		top_iph->tos = iph->tos;	/* DS disclosed */
		if (x->props.flags & XFRM_STATE_NOECN)
			IP_ECN_clear(top_iph);
		top_iph->tot_len = htons(skb->len + alen);
		top_iph->frag_off = iph->frag_off&htons(IP_DF);
		if (!(top_iph->frag_off))
			ip_select_ident(top_iph, dst, 0);
		top_iph->ttl = iph->ttl;	/* TTL disclosed */
		top_iph->check = 0;
		top_iph->saddr = x->props.saddr.a4;
		top_iph->daddr = x->id.daddr.a4;
		memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
	} else {
		esph = (struct ip_esp_hdr*)skb_push(skb, x->props.header_len);
		top_iph = (struct iphdr*)skb_push(skb, iph->ihl*4);
		memcpy(top_iph, &tmp_iph, iph->ihl*4);
		if (encap && encap->encap_type) {
			switch (encap->encap_type) {
			case UDP_ENCAP_ESPINUDP:
				uh = (struct udphdr*) esph;
				esph = (struct ip_esp_hdr*)(uh+1);
				top_iph->protocol = IPPROTO_UDP;
				break;
			default:
				printk(KERN_INFO
				       "esp_output(): Unhandled encap: %u\n",
				       encap->encap_type);
				top_iph->protocol = IPPROTO_ESP;
				break;
			}
		} else
			top_iph->protocol = IPPROTO_ESP;
		iph = &tmp_iph.iph;
		top_iph->tot_len = htons(skb->len + alen);
		top_iph->check = 0;
		top_iph->frag_off = iph->frag_off;
		*(u8*)(trailer->tail - 1) = iph->protocol;
	}

	/* this is non-NULL only with UDP Encapsulation */
	if (encap && uh) {
		uh->source = encap->encap_sport;
		uh->dest = encap->encap_dport;
		uh->len = htons(skb->len + alen - sizeof(struct iphdr));
		uh->check = 0;
	}

	esph->spi = x->id.spi;
	esph->seq_no = htonl(++x->replay.oseq);

	if (esp->conf.ivlen)
		crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));

	do {
		struct scatterlist sgbuf[nfrags>MAX_SG_ONSTACK ? 0 : nfrags];
		struct scatterlist *sg = sgbuf;

		if (unlikely(nfrags > MAX_SG_ONSTACK)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg)
				goto error;
		}
		skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
		crypto_cipher_encrypt(tfm, sg, sg, clen);
		if (unlikely(sg != sgbuf))
			kfree(sg);
	} while (0);

	if (esp->conf.ivlen) {
		memcpy(esph->enc_data, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
		crypto_cipher_get_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
	}

	if (esp->auth.icv_full_len) {
		esp->auth.icv(esp, skb, (u8*)esph-skb->data,
		              sizeof(struct ip_esp_hdr) + esp->conf.ivlen+clen, trailer->tail);
		pskb_put(skb, trailer, alen);
	}

	ip_send_check(top_iph);

	skb->nh.raw = skb->data;

	x->curlft.bytes += skb->len;
	x->curlft.packets++;
	spin_unlock_bh(&x->lock);
	if ((skb->dst = dst_pop(dst)) == NULL) {
		err = -EHOSTUNREACH;
		goto error_nolock;
	}
	return NET_XMIT_BYPASS;

error:
	spin_unlock_bh(&x->lock);
error_nolock:
	kfree_skb(skb);
	return err;
}
Ejemplo n.º 8
0
/*
 * Note: detecting truncated vs. non-truncated authentication data is very
 * expensive, so we only support truncated data, which is the recommended
 * and common case.
 */
int esp_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
{
	struct iphdr *iph;
	struct ip_esp_hdr *esph;
	struct esp_data *esp = x->data;
	struct sk_buff *trailer;
	int blksize = crypto_tfm_alg_blocksize(esp->conf.tfm);
	int alen = esp->auth.icv_trunc_len;
	int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
	int nfrags;
	int encap_len = 0;

	if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
		goto out;

	if (elen <= 0 || (elen & (blksize-1)))
		goto out;

	/* If integrity check is required, do this. */
	if (esp->auth.icv_full_len) {
		u8 sum[esp->auth.icv_full_len];
		u8 sum1[alen];
		
		esp->auth.icv(esp, skb, 0, skb->len-alen, sum);

		if (skb_copy_bits(skb, skb->len-alen, sum1, alen))
			BUG();

		if (unlikely(memcmp(sum, sum1, alen))) {
			x->stats.integrity_failed++;
			goto out;
		}
	}

	if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0)
		goto out;

	skb->ip_summed = CHECKSUM_NONE;

	esph = (struct ip_esp_hdr*)skb->data;
	iph = skb->nh.iph;

	/* Get ivec. This can be wrong, check against another impls. */
	if (esp->conf.ivlen)
		crypto_cipher_set_iv(esp->conf.tfm, esph->enc_data, crypto_tfm_alg_ivsize(esp->conf.tfm));

        {
		u8 nexthdr[2];
		struct scatterlist sgbuf[nfrags>MAX_SG_ONSTACK ? 0 : nfrags];
		struct scatterlist *sg = sgbuf;
		u8 workbuf[60];
		int padlen;

		if (unlikely(nfrags > MAX_SG_ONSTACK)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg)
				goto out;
		}
		skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
		crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen);
		if (unlikely(sg != sgbuf))
			kfree(sg);

		if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
			BUG();

		padlen = nexthdr[0];
		if (padlen+2 >= elen)
			goto out;

		/* ... check padding bits here. Silly. :-) */ 

		if (x->encap && decap && decap->decap_type) {
			struct esp_decap_data *encap_data;
			struct udphdr *uh = (struct udphdr *) (iph+1);

			encap_data = (struct esp_decap_data *) (decap->decap_data);
			encap_data->proto = 0;

			switch (decap->decap_type) {
			case UDP_ENCAP_ESPINUDP:

				if ((void*)uh == (void*)esph) {
					printk(KERN_DEBUG
					       "esp_input(): Got ESP; expecting ESPinUDP\n");
					break;
				}

				encap_data->proto = AF_INET;
				encap_data->saddr.a4 = iph->saddr;
				encap_data->sport = uh->source;
				encap_len = (void*)esph - (void*)uh;
				if (encap_len != sizeof(*uh))
				  printk(KERN_DEBUG
					 "esp_input(): UDP -> ESP: too much room: %d\n",
					 encap_len);
				break;

			default:
				printk(KERN_INFO
			       "esp_input(): processing unknown encap type: %u\n",
				       decap->decap_type);
				break;
			}
		}

		iph->protocol = nexthdr[1];
		pskb_trim(skb, skb->len - alen - padlen - 2);
		memcpy(workbuf, skb->nh.raw, iph->ihl*4);
		skb->h.raw = skb_pull(skb, sizeof(struct ip_esp_hdr) + esp->conf.ivlen);
		skb->nh.raw += encap_len + sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
		memcpy(skb->nh.raw, workbuf, iph->ihl*4);
		skb->nh.iph->tot_len = htons(skb->len);
	}

	return 0;

out:
	return -EINVAL;
}
Ejemplo n.º 9
0
static int esp6_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
{
	struct ipv6hdr *iph;
	struct ipv6_esp_hdr *esph;
	struct esp_data *esp = x->data;
	struct sk_buff *trailer;
	int blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4);
	int alen = esp->auth.icv_trunc_len;
	int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen;

	int hdr_len = skb->h.raw - skb->nh.raw;
	int nfrags;
	unsigned char *tmp_hdr = NULL;
	int ret = 0;

	if (!pskb_may_pull(skb, sizeof(struct ipv6_esp_hdr))) {
		ret = -EINVAL;
		goto out_nofree;
	}
	esph = (struct ipv6_esp_hdr*)skb->data;

	if (elen <= 0 || (elen & (blksize-1))) {
		ret = -EINVAL;
		goto out_nofree;
	}

	tmp_hdr = kmalloc(hdr_len, GFP_ATOMIC);
	if (!tmp_hdr) {
		ret = -ENOMEM;
		goto out_nofree;
	}
	memcpy(tmp_hdr, skb->nh.raw, hdr_len);

	/* If integrity check is required, do this. */
        if (esp->auth.icv_full_len) {
		u8 sum[esp->auth.icv_full_len];
		u8 sum1[alen];

		if (x->props.replay_window && xfrm_replay_check(x, esph->seq_no)) {
			ret = -EINVAL;
			goto out;
		}

		esp->auth.icv(esp, skb, 0, skb->len-alen, sum);

		if (skb_copy_bits(skb, skb->len-alen, sum1, alen))
			BUG();

		if (unlikely(memcmp(sum, sum1, alen))) {
			x->stats.integrity_failed++;
			ret = -EINVAL;
			goto out;
		}

		if (x->props.replay_window)
			xfrm_replay_advance(x, esph->seq_no);

	}

	if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0) {
		ret = -EINVAL;
		goto out;
	}

	skb->ip_summed = CHECKSUM_NONE;

	iph = skb->nh.ipv6h;

	/* Get ivec. This can be wrong, check against another impls. */
	if (esp->conf.ivlen)
		crypto_cipher_set_iv(esp->conf.tfm, esph->enc_data, crypto_tfm_alg_ivsize(esp->conf.tfm));

        {
		u8 nexthdr[2];
		struct scatterlist *sg = &esp->sgbuf[0];
		u8 padlen;

		if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg) {
				ret = -ENOMEM;
				goto out;
			}
		}
		skb_to_sgvec(skb, sg, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen, elen);
		crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen);
		if (unlikely(sg != &esp->sgbuf[0]))
			kfree(sg);

		if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
			BUG();

		padlen = nexthdr[0];
		if (padlen+2 >= elen) {
			LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen);
			ret = -EINVAL;
			goto out;
		}
		/* ... check padding bits here. Silly. :-) */ 

		pskb_trim(skb, skb->len - alen - padlen - 2);
		skb->h.raw = skb_pull(skb, sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen);
		skb->nh.raw += sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen;
		memcpy(skb->nh.raw, tmp_hdr, hdr_len);
		skb->nh.ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
		ret = nexthdr[1];
	}

out:
	kfree(tmp_hdr);
out_nofree:
	return ret;
}
Ejemplo n.º 10
0
static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;
	int hdr_len;
	struct ipv6hdr *top_iph;
	struct ipv6_esp_hdr *esph;
	struct crypto_tfm *tfm;
	struct esp_data *esp;
	struct sk_buff *trailer;
	int blksize;
	int clen;
	int alen;
	int nfrags;

	#if defined (CONFIG_OCTEON_NATIVE_IPSEC)
	if ((skb_is_nonlinear(skb) || skb_cloned(skb)) &&
	    skb_linearize(skb, GFP_ATOMIC) != 0) {
	    	err = -ENOMEM;
	    	goto error;
	}
	#endif

	esp = x->data;
	hdr_len = skb->h.raw - skb->data +
		  sizeof(*esph) + esp->conf.ivlen;

	/* Strip IP+ESP header. */
	__skb_pull(skb, hdr_len);

	/* Now skb is pure payload to encrypt */
	err = -ENOMEM;

	/* Round to block size */
	clen = skb->len;

	alen = esp->auth.icv_trunc_len;
	tfm = esp->conf.tfm;
	blksize = ALIGN(crypto_tfm_alg_blocksize(tfm), 4);
	clen = ALIGN(clen + 2, blksize);
	if (esp->conf.padlen)
		clen = ALIGN(clen, esp->conf.padlen);

	if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
		goto error;
	}

	/* Fill padding... */
	do {
		int i;
		for (i=0; i<clen-skb->len - 2; i++)
			*(u8*)(trailer->tail + i) = i+1;
	} while (0);
	*(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
	pskb_put(skb, trailer, clen - skb->len);

	top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len);
	esph = (struct ipv6_esp_hdr *)skb->h.raw;
	top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
	*(u8*)(trailer->tail - 1) = *skb->nh.raw;
	*skb->nh.raw = IPPROTO_ESP;

	esph->spi = x->id.spi;
	esph->seq_no = htonl(++x->replay.oseq);

	if (esp->conf.ivlen)
		crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));

#if defined (CONFIG_OCTEON_NATIVE_IPSEC)
	{
		int ret;
		int len = ((unsigned char *)esph - skb->data);
		__skb_pull(skb, len);
		if (esp->conf.ivlen) {
			memcpy(esph->enc_data, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
		}
		ret = cavium_process_esp_pkt(esp, skb);
		__skb_push(skb, len);
		if (esp->conf.ivlen) {
			crypto_cipher_get_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
		}
		if (likely(!ret)) {
	      if (esp->auth.icv_full_len) 
            skb_put(skb, alen);
			return 0;
		}
		if (unlikely(ret != -EIO))
			goto error;
		goto error;
	/*	
	 	if (esp->conf.ivlen)
			crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
	*/
	}
#else	

	do {
		struct scatterlist *sg = &esp->sgbuf[0];

		if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg)
				goto error;
		}
		skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
		crypto_cipher_encrypt(tfm, sg, sg, clen);
		if (unlikely(sg != &esp->sgbuf[0]))
			kfree(sg);
	} while (0);

	if (esp->conf.ivlen) {
		memcpy(esph->enc_data, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
		crypto_cipher_get_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
	}

	if (esp->auth.icv_full_len) {
		esp->auth.icv(esp, skb, (u8*)esph-skb->data,
			sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen+clen, trailer->tail);
		pskb_put(skb, trailer, alen);
	}
#endif /* CONFIG_OCTEON_NATIVE_IPSEC */	

	err = 0;

error:
	return err;
}
Ejemplo n.º 11
0
static int esp6_output(struct sk_buff *skb)
{
	int err;
	int hdr_len;
	struct dst_entry *dst = skb->dst;
	struct xfrm_state *x  = dst->xfrm;
	struct ipv6hdr *top_iph;
	struct ipv6_esp_hdr *esph;
	struct crypto_tfm *tfm;
	struct esp_data *esp;
	struct sk_buff *trailer;
	int blksize;
	int clen;
	int alen;
	int nfrags;

	esp = x->data;
	hdr_len = skb->h.raw - skb->data +
		  sizeof(*esph) + esp->conf.ivlen;

	/* Strip IP+ESP header. */
	__skb_pull(skb, hdr_len);

	/* Now skb is pure payload to encrypt */
	err = -ENOMEM;

	/* Round to block size */
	clen = skb->len;

	alen = esp->auth.icv_trunc_len;
	tfm = esp->conf.tfm;
	blksize = (crypto_tfm_alg_blocksize(tfm) + 3) & ~3;
	clen = (clen + 2 + blksize-1)&~(blksize-1);
	if (esp->conf.padlen)
		clen = (clen + esp->conf.padlen-1)&~(esp->conf.padlen-1);

	if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
		goto error;
	}

	/* Fill padding... */
	do {
		int i;
		for (i=0; i<clen-skb->len - 2; i++)
			*(u8*)(trailer->tail + i) = i+1;
	} while (0);
	*(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
	pskb_put(skb, trailer, clen - skb->len);

	top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len);
	esph = (struct ipv6_esp_hdr *)skb->h.raw;
	top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
	*(u8*)(trailer->tail - 1) = *skb->nh.raw;
	*skb->nh.raw = IPPROTO_ESP;

	esph->spi = x->id.spi;
	esph->seq_no = htonl(++x->replay.oseq);

	if (esp->conf.ivlen)
		crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));

	do {
		struct scatterlist *sg = &esp->sgbuf[0];

		if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg)
				goto error;
		}
		skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
		crypto_cipher_encrypt(tfm, sg, sg, clen);
		if (unlikely(sg != &esp->sgbuf[0]))
			kfree(sg);
	} while (0);

	if (esp->conf.ivlen) {
		memcpy(esph->enc_data, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
		crypto_cipher_get_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
	}

	if (esp->auth.icv_full_len) {
		esp->auth.icv(esp, skb, (u8*)esph-skb->data,
			sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen+clen, trailer->tail);
		pskb_put(skb, trailer, alen);
	}

	err = 0;

error:
	return err;
}
Ejemplo n.º 12
0
static int fill_sg_in(struct scatterlist *sg_in,
		      struct sk_buff *skb,
		      struct tls_offload_context_tx *ctx,
		      u64 *rcd_sn,
		      s32 *sync_size,
		      int *resync_sgs)
{
	int tcp_payload_offset = skb_transport_offset(skb) + tcp_hdrlen(skb);
	int payload_len = skb->len - tcp_payload_offset;
	u32 tcp_seq = ntohl(tcp_hdr(skb)->seq);
	struct tls_record_info *record;
	unsigned long flags;
	int remaining;
	int i;

	spin_lock_irqsave(&ctx->lock, flags);
	record = tls_get_record(ctx, tcp_seq, rcd_sn);
	if (!record) {
		spin_unlock_irqrestore(&ctx->lock, flags);
		WARN(1, "Record not found for seq %u\n", tcp_seq);
		return -EINVAL;
	}

	*sync_size = tcp_seq - tls_record_start_seq(record);
	if (*sync_size < 0) {
		int is_start_marker = tls_record_is_start_marker(record);

		spin_unlock_irqrestore(&ctx->lock, flags);
		/* This should only occur if the relevant record was
		 * already acked. In that case it should be ok
		 * to drop the packet and avoid retransmission.
		 *
		 * There is a corner case where the packet contains
		 * both an acked and a non-acked record.
		 * We currently don't handle that case and rely
		 * on TCP to retranmit a packet that doesn't contain
		 * already acked payload.
		 */
		if (!is_start_marker)
			*sync_size = 0;
		return -EINVAL;
	}

	remaining = *sync_size;
	for (i = 0; remaining > 0; i++) {
		skb_frag_t *frag = &record->frags[i];

		__skb_frag_ref(frag);
		sg_set_page(sg_in + i, skb_frag_page(frag),
			    skb_frag_size(frag), frag->page_offset);

		remaining -= skb_frag_size(frag);

		if (remaining < 0)
			sg_in[i].length += remaining;
	}
	*resync_sgs = i;

	spin_unlock_irqrestore(&ctx->lock, flags);
	if (skb_to_sgvec(skb, &sg_in[i], tcp_payload_offset, payload_len) < 0)
		return -EINVAL;

	return 0;
}
/*
 * Note: detecting truncated vs. non-truncated authentication data is very
 * expensive, so we only support truncated data, which is the recommended
 * and common case.
 */
static int esp_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
{
	struct iphdr *iph;
	struct ip_esp_hdr *esph;
	struct esp_data *esp = x->data;
	struct sk_buff *trailer;
	int blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4);
	int alen = esp->auth.icv_trunc_len;
	int elen = skb->len - sizeof(struct ip_esp_hdr) - esp->conf.ivlen - alen;
	int nfrags;
	int encap_len = 0;
	u8 nexthdr[2];
	struct scatterlist *sg;
	u8 workbuf[60];
	int padlen;

	if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr)))
		goto out;
	esph = (struct ip_esp_hdr*)skb->data;

	if (elen <= 0 || (elen & (blksize-1)))
		goto out;

	/* If integrity check is required, do this. */
	if (esp->auth.icv_full_len) {
		u8 sum[esp->auth.icv_full_len];
		u8 sum1[alen];
		if (x->props.replay_window && xfrm_replay_check(x, esph->seq_no))
			goto out;
		esp->auth.icv(esp, skb, 0, skb->len-alen, sum);

		if (skb_copy_bits(skb, skb->len-alen, sum1, alen))
			BUG();

		if (unlikely(memcmp(sum, sum1, alen))) {
			x->stats.integrity_failed++;
			goto out;
		}

		if (x->props.replay_window)
			xfrm_replay_advance(x, esph->seq_no);
	}

	if ((nfrags = skb_cow_data(skb, 0, &trailer)) < 0)
		goto out;

	skb->ip_summed = CHECKSUM_NONE;

	iph = skb->nh.iph;

	/* Get ivec. This can be wrong, check against another impls. */
	if (esp->conf.ivlen)
		crypto_cipher_set_iv(esp->conf.tfm, esph->enc_data, crypto_tfm_alg_ivsize(esp->conf.tfm));

	sg = &esp->sgbuf[0];

	if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
		sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
		if (!sg)
			goto out;
	}
	skb_to_sgvec(skb, sg, sizeof(struct ip_esp_hdr) + esp->conf.ivlen, elen);
	crypto_cipher_decrypt(esp->conf.tfm, sg, sg, elen);
	if (unlikely(sg != &esp->sgbuf[0]))
		kfree(sg);

	if (skb_copy_bits(skb, skb->len-alen-2, nexthdr, 2))
		BUG();

	padlen = nexthdr[0];
	if (padlen+2 >= elen)
		goto out;

	/* ... check padding bits here. Silly. :-) */ 

	if (x->encap) {
		struct xfrm_encap_tmpl *encap = x->encap;
		struct udphdr *uh;

		if (encap->encap_type != decap->decap_type)
			goto out;

		uh = (struct udphdr *)(iph + 1);
		encap_len = (void*)esph - (void*)uh;

		/*
		 * 1) if the NAT-T peer's IP or port changed then
		 *    advertize the change to the keying daemon.
		 *    This is an inbound SA, so just compare
		 *    SRC ports.
		 */
		if (iph->saddr != x->props.saddr.a4 ||
		    uh->source != encap->encap_sport) {
			xfrm_address_t ipaddr;

			ipaddr.a4 = iph->saddr;
			km_new_mapping(x, &ipaddr, uh->source);
				
			/* XXX: perhaps add an extra
			 * policy check here, to see
			 * if we should allow or
			 * reject a packet from a
			 * different source
			 * address/port.
			 */
		}
	
		/*
		 * 2) ignore UDP/TCP checksums in case
		 *    of NAT-T in Transport Mode, or
		 *    perform other post-processing fixes
		 *    as per draft-ietf-ipsec-udp-encaps-06,
		 *    section 3.1.2
		 */
		if (!x->props.mode)
			skb->ip_summed = CHECKSUM_UNNECESSARY;
	}

	iph->protocol = nexthdr[1];
	pskb_trim(skb, skb->len - alen - padlen - 2);
	memcpy(workbuf, skb->nh.raw, iph->ihl*4);
	skb->h.raw = skb_pull(skb, sizeof(struct ip_esp_hdr) + esp->conf.ivlen);
	skb->nh.raw += encap_len + sizeof(struct ip_esp_hdr) + esp->conf.ivlen;
	memcpy(skb->nh.raw, workbuf, iph->ihl*4);
	skb->nh.iph->tot_len = htons(skb->len);

	return 0;

out:
	return -EINVAL;
}
Ejemplo n.º 14
0
static int start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct virtnet_info *vi = netdev_priv(dev);
	int num, err;
	struct scatterlist sg[1+MAX_SKB_FRAGS];
	struct virtio_net_hdr *hdr;
	const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;

	sg_init_table(sg, 1+MAX_SKB_FRAGS);

	pr_debug("%s: xmit %p " MAC_FMT "\n", dev->name, skb,
		 dest[0], dest[1], dest[2],
		 dest[3], dest[4], dest[5]);

	/* Encode metadata header at front. */
	hdr = skb_vnet_hdr(skb);
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
		hdr->csum_start = skb->csum_start - skb_headroom(skb);
		hdr->csum_offset = skb->csum_offset;
	} else {
		hdr->flags = 0;
		hdr->csum_offset = hdr->csum_start = 0;
	}

	if (skb_is_gso(skb)) {
		hdr->hdr_len = skb_transport_header(skb) - skb->data;
		hdr->gso_size = skb_shinfo(skb)->gso_size;
		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
		else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
		else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
			hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
		else
			BUG();
		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
			hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
	} else {
		hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
		hdr->gso_size = hdr->hdr_len = 0;
	}

	vnet_hdr_to_sg(sg, skb);
	num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1;
	__skb_queue_head(&vi->send, skb);

again:
	/* Free up any pending old buffers before queueing new ones. */
	free_old_xmit_skbs(vi);
	err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb);
	if (err) {
		pr_debug("%s: virtio not prepared to send\n", dev->name);
		netif_stop_queue(dev);

		/* Activate callback for using skbs: if this returns false it
		 * means some were used in the meantime. */
		if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) {
			vi->svq->vq_ops->disable_cb(vi->svq);
			netif_start_queue(dev);
			goto again;
		}
		__skb_unlink(skb, &vi->send);

		return NETDEV_TX_BUSY;
	}
	vi->svq->vq_ops->kick(vi->svq);

	return 0;
}
Ejemplo n.º 15
0
static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
{
	int err;
	int hdr_len;
	struct ipv6hdr *top_iph;
	struct ipv6_esp_hdr *esph;
	struct crypto_blkcipher *tfm;
	struct blkcipher_desc desc;
	struct esp_data *esp;
	struct sk_buff *trailer;
	int blksize;
	int clen;
	int alen;
	int nfrags;

	esp = x->data;
	hdr_len = skb->h.raw - skb->data +
		  sizeof(*esph) + esp->conf.ivlen;

	/* Strip IP+ESP header. */
	__skb_pull(skb, hdr_len);

	/* Now skb is pure payload to encrypt */
	err = -ENOMEM;

	/* Round to block size */
	clen = skb->len;

	alen = esp->auth.icv_trunc_len;
	tfm = esp->conf.tfm;
	desc.tfm = tfm;
	desc.flags = 0;
	blksize = ALIGN(crypto_blkcipher_blocksize(tfm), 4);
	clen = ALIGN(clen + 2, blksize);
	if (esp->conf.padlen)
		clen = ALIGN(clen, esp->conf.padlen);

	if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
		goto error;
	}

	/* Fill padding... */
	do {
		int i;
		for (i=0; i<clen-skb->len - 2; i++)
			*(u8*)(trailer->tail + i) = i+1;
	} while (0);
	*(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
	pskb_put(skb, trailer, clen - skb->len);

	top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len);
	esph = (struct ipv6_esp_hdr *)skb->h.raw;
	top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
	*(u8*)(trailer->tail - 1) = *skb->nh.raw;
	*skb->nh.raw = IPPROTO_ESP;

	esph->spi = x->id.spi;
	esph->seq_no = htonl(++x->replay.oseq);
	xfrm_aevent_doreplay(x);

	if (esp->conf.ivlen) {
		if (unlikely(!esp->conf.ivinitted)) {
			get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
			esp->conf.ivinitted = 1;
		}
		crypto_blkcipher_set_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
	}

	do {
		struct scatterlist *sg = &esp->sgbuf[0];

		if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg)
				goto error;
		}
		skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
		err = crypto_blkcipher_encrypt(&desc, sg, sg, clen);
		if (unlikely(sg != &esp->sgbuf[0]))
			kfree(sg);
	} while (0);

	if (unlikely(err))
		goto error;

	if (esp->conf.ivlen) {
		memcpy(esph->enc_data, esp->conf.ivec, esp->conf.ivlen);
		crypto_blkcipher_get_iv(tfm, esp->conf.ivec, esp->conf.ivlen);
	}

	if (esp->auth.icv_full_len) {
		err = esp_mac_digest(esp, skb, (u8 *)esph - skb->data,
				     sizeof(*esph) + esp->conf.ivlen + clen);
		memcpy(pskb_put(skb, trailer, alen), esp->auth.work_icv, alen);
	}

error:
	return err;
}
Ejemplo n.º 16
0
int
skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len)
{
	int start = skb_headlen(skb);
	int i, copy = start - offset;
	int elt = 0;

	if (copy > 0) {
		if (copy > len)
			copy = len;
		sg[elt].page = virt_to_page(skb->data + offset);
		sg[elt].offset = (unsigned long)(skb->data + offset) % PAGE_SIZE;
		sg[elt].length = copy;
		elt++;
		if ((len -= copy) == 0)
			return elt;
		offset += copy;
	}

	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
		int end;

		BUG_TRAP(start <= offset + len);

		end = start + skb_shinfo(skb)->frags[i].size;
		if ((copy = end - offset) > 0) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

			if (copy > len)
				copy = len;
			sg[elt].page = frag->page;
			sg[elt].offset = frag->page_offset+offset-start;
			sg[elt].length = copy;
			elt++;
			if (!(len -= copy))
				return elt;
			offset += copy;
		}
		start = end;
	}

	if (skb_shinfo(skb)->frag_list) {
		struct sk_buff *list = skb_shinfo(skb)->frag_list;

		for (; list; list = list->next) {
			int end;

			BUG_TRAP(start <= offset + len);

			end = start + list->len;
			if ((copy = end - offset) > 0) {
				if (copy > len)
					copy = len;
				elt += skb_to_sgvec(list, sg+elt, offset - start, copy);
				if ((len -= copy) == 0)
					return elt;
				offset += copy;
			}
			start = end;
		}
	}
	BUG_ON(len);
	return elt;
}
Ejemplo n.º 17
0
int esp6_output(struct sk_buff *skb)
{
	int err;
	int hdr_len = 0;
	struct dst_entry *dst = skb->dst;
	struct xfrm_state *x  = dst->xfrm;
	struct ipv6hdr *iph = NULL, *top_iph;
	struct ipv6_esp_hdr *esph;
	struct crypto_tfm *tfm;
	struct esp_data *esp;
	struct sk_buff *trailer;
	int blksize;
	int clen;
	int alen;
	int nfrags;
	u8 *prevhdr;
	u8 nexthdr = 0;

	/* First, if the skb is not checksummed, complete checksum. */
	if (skb->ip_summed == CHECKSUM_HW && skb_checksum_help(skb) == NULL) {
		err = -EINVAL;
		goto error_nolock;
	}

	spin_lock_bh(&x->lock);
	err = xfrm_check_output(x, skb, AF_INET6);
	if (err)
		goto error;
	err = -ENOMEM;

	/* Strip IP header in transport mode. Save it. */

	if (!x->props.mode) {
		hdr_len = ip6_find_1stfragopt(skb, &prevhdr);
		nexthdr = *prevhdr;
		*prevhdr = IPPROTO_ESP;
		iph = kmalloc(hdr_len, GFP_ATOMIC);
		if (!iph) {
			err = -ENOMEM;
			goto error;
		}
		memcpy(iph, skb->nh.raw, hdr_len);
		__skb_pull(skb, hdr_len);
	}

	/* Now skb is pure payload to encrypt */

	/* Round to block size */
	clen = skb->len;

	esp = x->data;
	alen = esp->auth.icv_trunc_len;
	tfm = esp->conf.tfm;
	blksize = (crypto_tfm_alg_blocksize(tfm) + 3) & ~3;
	clen = (clen + 2 + blksize-1)&~(blksize-1);
	if (esp->conf.padlen)
		clen = (clen + esp->conf.padlen-1)&~(esp->conf.padlen-1);

	if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
		if (!x->props.mode && iph) kfree(iph);
		goto error;
	}

	/* Fill padding... */
	do {
		int i;
		for (i=0; i<clen-skb->len - 2; i++)
			*(u8*)(trailer->tail + i) = i+1;
	} while (0);
	*(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
	pskb_put(skb, trailer, clen - skb->len);

	if (x->props.mode) {
		iph = skb->nh.ipv6h;
		top_iph = (struct ipv6hdr*)skb_push(skb, x->props.header_len);
		esph = (struct ipv6_esp_hdr*)(top_iph+1);
		*(u8*)(trailer->tail - 1) = IPPROTO_IPV6;
		top_iph->version = 6;
		top_iph->priority = iph->priority;
		top_iph->flow_lbl[0] = iph->flow_lbl[0];
		top_iph->flow_lbl[1] = iph->flow_lbl[1];
		top_iph->flow_lbl[2] = iph->flow_lbl[2];
		if (x->props.flags & XFRM_STATE_NOECN)
			IP6_ECN_clear(top_iph);
		top_iph->nexthdr = IPPROTO_ESP;
		top_iph->payload_len = htons(skb->len + alen - sizeof(struct ipv6hdr));
		top_iph->hop_limit = iph->hop_limit;
		ipv6_addr_copy(&top_iph->saddr,
			       (struct in6_addr *)&x->props.saddr);
		ipv6_addr_copy(&top_iph->daddr,
			       (struct in6_addr *)&x->id.daddr);
	} else { 
		esph = (struct ipv6_esp_hdr*)skb_push(skb, x->props.header_len);
		skb->h.raw = (unsigned char*)esph;
		top_iph = (struct ipv6hdr*)skb_push(skb, hdr_len);
		memcpy(top_iph, iph, hdr_len);
		kfree(iph);
		top_iph->payload_len = htons(skb->len + alen - sizeof(struct ipv6hdr));
		*(u8*)(trailer->tail - 1) = nexthdr;
	}

	esph->spi = x->id.spi;
	esph->seq_no = htonl(++x->replay.oseq);

	if (esp->conf.ivlen)
		crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));

	do {
		struct scatterlist sgbuf[nfrags>MAX_SG_ONSTACK ? 0 : nfrags];
		struct scatterlist *sg = sgbuf;

		if (unlikely(nfrags > MAX_SG_ONSTACK)) {
			sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
			if (!sg)
				goto error;
		}
		skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
		crypto_cipher_encrypt(tfm, sg, sg, clen);
		if (unlikely(sg != sgbuf))
			kfree(sg);
	} while (0);

	if (esp->conf.ivlen) {
		memcpy(esph->enc_data, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
		crypto_cipher_get_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
	}

	if (esp->auth.icv_full_len) {
		esp->auth.icv(esp, skb, (u8*)esph-skb->data,
			sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen+clen, trailer->tail);
		pskb_put(skb, trailer, alen);
	}

	skb->nh.raw = skb->data;

	x->curlft.bytes += skb->len;
	x->curlft.packets++;
	spin_unlock_bh(&x->lock);
	if ((skb->dst = dst_pop(dst)) == NULL) {
		err = -EHOSTUNREACH;
		goto error_nolock;
	}
	return NET_XMIT_BYPASS;

error:
	spin_unlock_bh(&x->lock);
error_nolock:
	kfree_skb(skb);
	return err;
}